Related Documentation

CLI User Interface Overview

You can use two interfaces to monitor, configure, troubleshoot,
and manage a Juniper Networks EX Series Ethernet Switch: the J-Web
graphical user interface and the Junos operating system (Junos OS)
command-line interface (CLI). Both of these user interfaces are shipped
with the switch. This topic describes the CLI. For information about
the J-Web user interface, see J-Web User Interface for EX Series Switches Overview.

CLI Overview

Junos operating system (Junos OS) CLI is a Juniper Networks
specific command shell that runs on top of a UNIX-based operating
system kernel. The CLI provides command help and command completion.

The CLI also provides a variety of UNIX utilities, such as Emacs-style
keyboard sequences that allow you to move around on a command line
and scroll through recently executed commands, regular expression
matching to locate and replace values and identifiers in a configuration,
filter command output, or log file entries, store and archive router
files on a UNIX-based file system, and exit from the CLI environment
and create a UNIX C shell or Bourne shell to navigate the file system,
manage switch processes, and so on.

CLI Help and Command Completion

To access CLI Help, type a question mark (?) at any level of the hierarchy. The system displays a list of the
available commands or statements and a short description of each.

To complete a command, statement, or option that you have partially
typed, press the Tab key or the Spacebar. If the partially typed letters
uniquely identify a command, the complete command name appears. Otherwise,
a beep indicates that you have entered an ambiguous command and the
possible completions are displayed. This completion feature also applies
to other strings, such as filenames, interface names, usernames, and
configuration statements.

CLI Command Modes

The CLI has two modes, operational mode and configuration mode.

In operational mode, you enter commands to monitor and troubleshoot
switch hardware and software and network connectivity. Operational
mode is indicated by the > prompt—for example, user@switch>.

In configuration mode, you can define all properties of the
Juniper Networks Junos operating system (Junos OS), including interfaces,
VLANs, Virtual Chassis information,
routing protocols, user access, and several system hardware properties.

To enter configuration mode, enter the configure command:
.

user@switch> configure

Configuration mode is indicated by the # prompt, and
includes the current location in the configuration hierarchy—for
example:

[edit interfaces ge-0/0/12]user@switch#

In configuration mode, you are actually viewing and changing
the candidate configuration file. The candidate configuration allows
you to make configuration changes without causing operational changes
to the current operating configuration, called the active configuration.
When you commit the changes you added to the candidate configuration,
the system updates the active configuration. Candidate configurations
enable you to alter your configuration without causing potential damage
to your current network operations.

To activate your configuration changes, enter the commit command.

To return to operational mode, go to the top of the configuration
hierarchy and then quit—for example:

[edit interfaces ge-0/0/12]user@switch# top[edit]user@switch# exit

You can also activate your configuration changes and exit configuration
mode with a single command, commit and-quit. This command
succeeds only if there are no mistakes or syntax errors in the configuration.

Tip:
When you commit the candidate configuration, you can require
an explicit confirmation for the commit to become permanent by using
the commit confirmed command. This is useful for verifying
that a configuration change works correctly and does not prevent management
access to the switch. After you issue the commit confirmed command, you must issue another commit command within
the defined period of time (10 minutes by default) or the system reverts
to the previous configuration.